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Home >> Lexus >> 2024 >> TX 350 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 79 (Hybrid Control System - Diagnostic Codes (4 Of 5)) >> HYBRID CONTROL SYSTEM (for 1Motor-HEV Model) >> DTC P3107-15: Lost Communication with Airbag System Control Module Circuit Short to Auxiliary Battery or Open [09/2023 - ] >> Procedure

DTC P3107-15: Lost Communication with Airbag System Control Module Circuit Short to Auxiliary Battery or Open [09/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT (SRS AIRBAG) 

    Pre-procedure1

    • None.
    • Check for DTCs.

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Result  Proceed to
      DTCs are not output A
      DTCs are output B

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART (AIRBAG SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2023 - 12/2023]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2023 - ] 

    Result: 

    A 

    See step  2

  2. CHECK AIRBAG ECU ASSEMBLY (CHECK WAVEFORM) 

    See step  2

    Result

    Result  Proceed to
    The waveform appears as shown in the illustration A
    The waveform differs from the one shown in the illustration B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  3

  3. CLEAR DTC 

    Refer to PROCEDURE - Step 3

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK DTC OUTPUT (HYBRID CONTROL) 

    Pre-procedure1

    • None.
    • Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result  Proceed to
      P3107-15 is not output A
      P3107-15 is output B

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    B 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [09/2023 - 12/2023]  , or refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  5

  5. CHECK FOR INTERMITTENT PROBLEMS 

    HINT: 

    Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [09/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [09/2023 - 12/2023]  , or refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

  6. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU ASSEMBLY CONNECTOR) 

    Refer to PROCEDURE - Step 1

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  7

  7. CHECK CONNECTOR CONNECTION CONDITION (AIRBAG ECU ASSEMBLY CONNECTOR) 
    1. Check the connector connections and contact pressure of the relevant terminals for the airbag ECU assembly connector.
      GTY1199455Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Airbag ECU Assembly)

      OK

      The connectors are connected securely and there are no contact pressure problems.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - AIRBAG ECU ASSEMBLY) 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU assembly connector.
    • Disconnect the airbag ECU assembly connector.
    • Turn the ignition switch to ON.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      D44-12 (ABFS) - Body ground Ignition switch ON Below 1 V V
      NOTE:

      Turning the ignition switch to ON with the airbag ECU assembly connector and the hybrid vehicle control ECU assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    Pre-procedure2

    • Turn the ignition switch off.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition Result
      D44-12 (ABFS) - D47-24 (GSW2) Ignition switch off Below 1 Ω Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition Result
      D44-12 (ABFS) or D47-24 (GSW2) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ

      HINT: 

      As necessary, check that there are no wires shorted to power supply when performing the above wire harness inspection.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the airbag ECU assembly connector.
    • Reconnect the hybrid vehicle control ECU assembly connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY 

    Pre-procedure1

    • Disconnect the airbag ECU assembly connector.
    • Turn the ignition switch to ON.
    • Measure the voltage according to the value(s) in the table below.
      GTY1234211Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU Assembly)      		 - -
      NOTE:

      Turning the ignition switch to ON with the airbag ECU assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      D44-12 (ABFS) - Body ground Ignition switch ON 11 to 14 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Turn the ignition switch off.
    • Reconnect the airbag ECU assembly connector.

    Result: 

    OK 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [09/2023 - 12/2023]  , or refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [09/2023 - 12/2023]  , or refer to  REMOVAL [12/2023 - ] 

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